[R] Creating nice looking lists: how?

[Greg Snow]

Others have shown you where to find the actual printing code for
print.summary.lm, but the short answer is:

Use the cat function for the general text (the word "coefficients:" and
the signif codes at the bottom)
And put the actual coefficients in a matrix, use colnames and rownames
to add column and row headers, then use print.matrix with quote=FALSE to
print out the matrix of coefficients.

For more detailed printing look at ?cat, ?format, and ?sprintf.

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Sergey Goriatchev
> Sent: Friday, September 28, 2007 8:03 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Creating nice looking lists: how?
> 
> Hello,
> 
> For my functions I want to create output similar in 
> appearance to that of what you get when you print a summary 
> of lm model:
> 
> Residuals:
>       Min        1Q         Median        3Q           Max
> -0.209209 -0.043133  0.001793  0.044105  0.234750
> 
> Coefficients:
>                  Estimate  Std. Error  t value    Pr(>|t|)
> (Intercept)  0.981762   0.004089 240.103  < 2e-16 ***
> Factor 1    -0.009581   0.006381  -1.501 0.134296
> Factor 2    -0.008993   0.009182  -0.979 0.328163
> Factor 3     0.029960   0.009547   3.138 0.001866 **
> Factor 4    -0.026575   0.007370  -3.606 0.000363 ***
> Factor 5    -0.004847   0.006382  -0.760 0.448138
> Factor 6     0.005099   0.006483   0.786 0.432202
> ---
> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
> 
> I want:
> 1) no $ before the list component names
> 2) component names that take values from outside variables
> (ex.: number <- 10
>        There are 'number' factors in the model:)
> 
> There is not much information on how to create nice output in 
> terms of lists, so I was looking for core to write the 
> summary(lm) output, but could not find much. Obviously, I can 
> type summary.lm, but it does not show how to create the name 
> "Coefficients:"
> 
> Could someone give me pointers on how to create nice lists?
> 
> Thanks
> Sergey
> 
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